Section 36.1 of the Octave manual abbreviates Coordinated Universal Time to CUT. The correct abbreviation is UTC, see
https://en.wikipedia.org/wiki/Coordinated_Universal_Time
which says: The official abbreviation for Coordinated Universal Time is UTC. This abbreviation arose from a desire by the International Telecommunication Union and the International Astronomical Union to use the same abbreviation in all languages. English speakers originally proposed CUT (for "coordinated universal time"), while French speakers proposed TUC (for "temps universel coordonné").